Drinking water system filters typically need replacing once a year. Here you will find drinking water system filters that meet your needs, depending on what you are trying to avoid having in your drinking water. Some water system filters can be connected to the pipes leading to your hot-water heater for fresh water wherever you need your hot water. Other water filters are designed to connect to where the main water line enters the house. Most water filters are designed for drinking and can be used with your drinking water filtration systems at the sink or for the refrigerator.